On version h, cookies are not being saved. I have it set to delete all non-favorite on safari quit, but even favorite ones are being deleted. Sometimes a couple stick around but more often than not, everything is gone. The favorites still show up in the list but there are 0 cookies attached to the favorite and they are greyed out.

It also takes an extremely long time for new cookies to show up in the cookie window. Back on stable release, i would log into a new site, open the cookie window right away to mark it as a favorite and it was already there. now under beta h, it takes at least 30 seconds for the cookie to show up in the cookie window to mark it as a favorite (even though it doesn't matter at this point because its not saving them anyways haha)

Apple has removed official support for cookie access in El Capitan, and I've had to access them manually. reading the cookie file is not so difficult, however Apple has added a security key to the file making writing to the cookie file extremely difficult....
(well the difficulty is not so much the in the writing of the file, but in having Safari accept the newly written cookie file as being legitimate)